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Date: Wed, 07 Dec 2011 08:03:22 -0500
From: Ken Brown <kbrown AT cornell DOT edu>
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To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] CALL FOR TESTING: Cygwin 1.7.10
References: <announce DOT 20111206093746 DOT GA6222 AT calimero DOT vinschen DOT de> <4EDE52F7 DOT 2080206 AT cornell DOT edu> <20111206175752 DOT GA16033 AT calimero DOT vinschen DOT de> <4EDE5EDF DOT 60102 AT cornell DOT edu> <20111206200224 DOT GB16033 AT calimero DOT vinschen DOT de> <4EDED4B4 DOT 5070501 AT cornell DOT edu> <20111207032223 DOT GB15262 AT ednor DOT casa DOT cgf DOT cx>
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On 12/6/2011 10:22 PM, Christopher Faylor wrote:
> On Tue, Dec 06, 2011 at 09:51:32PM -0500, Ken Brown wrote:
>> On 12/6/2011 3:02 PM, Corinna Vinschen wrote:
>>> On Dec  6 13:28, Ken Brown wrote:
>>>> On 12/6/2011 12:57 PM, Corinna Vinschen wrote:
>>>>> On Dec  6 12:37, Ken Brown wrote:
>>>>>> On 12/6/2011 4:37 AM, Corinna Vinschen wrote:
>>>>>>> A lot of changes and fixes have been made in Cygwin since 1.7.9 has
>>>>>>> been released, so we're looking forward to release Cygwin 1.7.10 soon.
>>>>>>>
>>>>>>> Please test the latest developer snapshots at http://cygwin.com/snapshots/
>>>>>>> which should have "Release Candidate" quality.
>>>>>>
>>>>>> Here's an easily reproducible problem with the 2011-12-05
>>>>>> cygwin1.dll snapshot:
>>>>>>
>>>>>> 1. Download cygwin-inst-20111205.tar.bz2 .
>>>>>>
>>>>>> 2. Start mintty from the Cygwin Terminal shortcut.
>>>>>>
>>>>>> 3. tar -C/ -xf /path/to/cygwin-inst-20111205.tar.bz2
>>>>>> --exclude=usr/bin/cygwin1.dll
>>>>>>
>>>>>> An hourglass appears and tar doesn't run.  I'm on W7-64 if that
>>>>>> makes a difference.
>>>>>
>>>>> Works for me.  I just tried from mintty with bash as login shell as
>>>>> well as with tcsh as login shell.  I even left out the --exclude and
>>>>> it worked ;)
>>>>>
>>>>> Does that really occur reproducible on your machine, every try?
>>>>
>>>> Yes.  And I just tried twice more with the same behavior.  Earlier
>>>> today I had a similar thing occur on a different machine, on which
>>>> the 2011-12-04 dll was installed instead of the 2011-12-05 dll.  On
>>>> that machine (again W7-64), the mintty window simply disappeared
>>>> when I gave the tar command.
>>>
>>> Hmm, that's weird.
>>>
>>>> The only other detail I can think of is that I started mintty by
>>>> right-clicking on the shortcut and choosing "Run as administrator".
>>>
>>> Still works for me.  That's puzzeling.  Any chance to debug that?
>>> Stracing, attaching with GDB, building your own debug-enabled Cygwin,
>>> etc?
>>
>> I ran the tar command under strace.  I'm not good at deciphering strace
>> output, but you can see it here:
>>
>>    http://www.math.cornell.edu/~kbrown/cygwin/strace.out
>>
>> A few further observations:
>>
>> - As the strace output shows, tar does in fact run, contrary to what I
>> originally thought; it's just that there's no indication in the terminal
>> that tar finished.
>>
>> - When I finally get tired of waiting and kill mintty (and the
>> associated bash process) from another terminal, mintty leaves the
>> following stackdump on the desktop:
>>
>> Exception: STATUS_ACCESS_VIOLATION at eip=610CD8B1
>> eax=0000010C ebx=0028C880 ecx=00000000 edx=0000010C esi=00000000
>> edi=0028C860
>> ebp=0028C7C8 esp=0028C790 program=C:\cygwin\bin\mintty.exe, pid 4972,
>> thread main
>> cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B
>> Stack trace:
>> Frame     Function  Args
>> 0028C7C8  610CD8B1  (0000010C, 0028C95C, 0028C880, 0028C860)
>> 0028C938  610CDC42  (00000002, 0028C95C, 00000000, 00000000)
>> 20052168  610D1FE5  (00630072, 00000000, 00000018, 00000033)
>> 200524F0  00000000  (6E776F72, 6D64612D, 2E2F6E69, 746E696D)
>> End of stack trace
>>
>> - Other mintty windows that are open become unusable.  The title bar
>> shows "not responding".
>>
>> Does any of this help?  Should I be stracing mintty rather than tar?
>
> Apparently yes.  I can't reproduce this either.  The strace you provided
> does look perfectly normal.

OK.  I started mintty from the Cygwin Terminal shortcut, attached strace 
to it in a second terminal, and ran the tar command in the first 
terminal.  The strace output is at

   http://www.math.cornell.edu/~kbrown/cygwin/strace_mintty.out

Here's one more data point: The problem occurs only in a mintty started 
from the shortcut.  If I start mintty from an existing mintty, I can run 
the tar command without a problem.

Ken

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